? Why do people do a thing? Apart from the control of passion and the desire given by the body, the rest are all useful principles and interests that belong to rational control. The interaction between useful principles and environment and interests has become a habit. Interest is rooted in genes, rooted in the soul, what people naturally like to do and how to do things, which have been written into the gene map at birth. Interest is different from the principle of usefulness, and the principle of usefulness may change at any time with the change of people's ideas, not necessarily what they like. It is a short-term driving force, and interest is what they really like, and it is a continuous driving force.

People want a concrete thing, they need a little care and a little execution, but it takes decades or even a lifetime to complete a career and push themselves to this goal, not just talking, forcing themselves to work hard, but to be the real desire of the soul. What we really want to do enables us to endure all kinds of unfavorable environment and make us spend time and energy to finish it whenever we have the chance.

? Sartre said that "others are hell". People who live in society cannot be unaffected by others. If there is nothing they really like, they will just go with the flow and be busy with what is in front of them, and time flies.

Interest is so important for a person, especially for a child who is in the period of discovering and cultivating interest. No matter how we don't understand and don't interfere, we should try our best to help children find new interests, let them do what they like, let them find what they really like, and be willing to pay for it constantly, so as to become different.